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Pollution and Sources Study of Heavy Metals in Sediments ofXi Baisha Small Watershed in Dianchi(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2017年04期
Page:
120-
Research Field:
·地理学·
Publishing date:

Info

Title:
Pollution and Sources Study of Heavy Metals in Sediments ofXi Baisha Small Watershed in Dianchi
Author(s):
Xie Yun; Wang Yanhua; Yang Hao
School of Geography Science,Nanjing Normal University,Nanjing 210023,China
Keywords:
Dianchi; Xi Baisha; sediment; heavy metal
PACS:
X53
DOI:
10.3969/j.issn.1001-4616.2017.04.020
Abstract:
Taking Xi Baisha small watershed in Dianchi as the study object,heavy metals of Cu,Pb,Cd,Zn and Cr pollution status and source in sediments were studied,and the results showed that:0-31 cm samples time was 1881-2011 in the deposition,the average sedimentation rate was about 0.20 cm/a. The contents of heavy metals in sediments were generally lower and more stable before 1960,and then showed up was ward trends. As time went on,the closer to the surface of the sediments was,the greater the environmental risk of heavy metals was. The potential ecological hazard index method showed that the damage degree of single elements in Cu,Zn,Pb,Cd and Cr were moderate,moderate,minor,extreme and minorand,and the hazard index RI showed an upward trend as a whole. The ecological risk of pollution mainly came from Cd elements. From the unstable content of different heavy metals,the heavy metals had great ecological harm to the environment. The order of risk was Cd>Zn>Cu>Cr>Pb. Pb and Cu,Zn and Cr in the sediments of the small watershed were significantly correlated at 0.05 level,and the correlation coefficients were 0.45 and 0.38. The extraction of three principal components of heavy metal pollution sources,analysised with industrial development in Yunnan area,the main sources of heavy metal pollution were:chemical wastewater emission of iron and steel accounted for 27.06%; mining processing and transportation of dust contribution rate was 25.03%,the contribution rate of mining processing wastewater was 21.94%,other sources accounted for 25.97%.

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Last Update: 2017-12-30